The answer is yes, but only a small section of Sinnoh. During the little Arceus event you trigger when having your Arceus in the first of your party while vising the ruins of alph, you're sent to a small portion of the 4th gen region. Though that's about all you're going to see; not much.

actualy, there is a way to get to a part of the sinnoh region. you need to bring an arceus to the ruins of alph and go to the research facility and show it to the scientists there. once you do that, one of the scientists should show you to a part of the ruins that wasn't there before. then, cynthia the champion of sinnoh should be there. after that, she tells you that you can pick one out of three pokemon, palkia, dialga, or giratina to take with you on your adventures. I forgot to mention that this part of the ruins is in sinnoh.

Guest said: 3rd Jul 2011, ID #54417 | REPORT
Can somebody please tell me how the code to go to Sinnoh works?!!! Oh and also, can you battle the Sinnoh gym leaders with it? I mainly want it to go to Eterna forest and the route with the ice rock so I can get the final 2 eevelutions!!!

Guest said: 7th Apr 2012, ID #130746 | REPORT
Ummm...just saying this but you can catch some hoen and sinnoh pokemon but its in the safari zone. to get them, you need to be able to place down items on a certain area

Guest said: 17th Dec 2013, ID #330401 | REPORT
why wanted to go to sinnoh download pkmn storm silver the same game hack but difficult and cynthia will give u evee and a old man will allow u to chose any stones that has all evee forms eg : glacion,umbreon,leafeon,espeon.jolteon,flareion,vaporeon

Guest answered:
Added 16th May 2012, ID #507420

You are crazy people. I have sinnoh and hoenn pokemon. You just put on dj ben on thurs. For sinnoh and wed. For hoenn. By the way you can get umbreon and glaceon by leveling up with friendship. DUHHH

I brought my arceus to the reserch center but no one brought me to the sinnoh ruins! I don't get it? I got the arceus from my friend and he got it from an event. Is there something wrong with my arcus? :(

Guest said: 9th Jun 2013, ID #289154 | REPORT
ill tell you how to get hoenn pokemon on wendsdays this person will ring you he will say go to your poke gear radio and say professor oak wanted to let you know that theres a new radio signall go to the radio and you will find hoenn sounds walk in the grass and you will find hoenn pokemon

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